20545957 has 2 divisors, whose sum is σ = 20545958. Its totient is φ = 20545956.

The previous prime is 20545939. The next prime is 20546023. The reversal of 20545957 is 75954502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15992001 + 4553956 = 3999^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 20545957 - 2⁷ = 20545829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20545907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272978 + 10272979.

It is an arithmetic number, because the mean of its divisors is an integer number (10272979).

Almost surely, 2^20545957 is an apocalyptic number.

It is an amenable number.

20545957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545957 is an equidigital number, since it uses as much as digits as its factorization.

20545957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 20545957 is about 4532.7648295494. The cubic root of 20545957 is about 273.8895473614.

The spelling of 20545957 in words is "twenty million, five hundred forty-five thousand, nine hundred fifty-seven".